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Visualising Solid Shapes — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSVisualising Solid Shapes1 Mark
MCQ
We have $4$ congruent equilateral triangles. What do we need more to make a pyramid?
  • A
    An equilateral triangle.
  • ✓
    A square with same side length as of triangle.
  • C
    $2$ equilateral triangles with side length same as triangle.
  • D
    $2$ squares with side length same as triangle.
✓

Answer

Correct option: B.
A square with same side length as of triangle.
We know that, a pyramid is a polyhedron, whose base is a polygon and lateral faces are triangles. But in the question, we have only $4$ congruent equilateral triangles. Thus, we have to add a polygon in the base of atleast a four-sided figure.
Hence, option $(b)$ is required to make a pyramid.

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